!str Se refiere al comando más reciente que comienza con str. este es el comportamiento de expansión del historial. tipo
man zshexpn
y marque "Designadores de eventos", obtendrá la respuesta
Un designador de evento es una referencia a una entrada de la línea de comandos en la lista del historial. En la lista de abajo, recuerde que la inicial `!' en de cada elemento puede cambiarse por otro carácter estableciendo el parámetro histchars.
! Start a history expansion, except when followed by a blank, newline, `=' or `('. If followed immediately by a word designator
(see the section `Word Designators'), this forms a history reference with no event designator (see the section `Overview').
!! Refer to the previous command. By itself, this expansion repeats the previous command.
!n Refer to command-line n.
!-n Refer to the current command-line minus n.
!str Refer to the most recent command starting with str.
!?str[?]
Refer to the most recent command containing str. The trailing `?' is necessary if this reference is to be followed by a modi-
fier or followed by any text that is not to be considered part of str.
!# Refer to the current command line typed in so far. The line is treated as if it were complete up to and including the word
before the one with the `!#' reference.
!{...} Insulate a history reference from adjacent characters (if necessary).
